OK, I take pity on you guys, here's the complete PCB design with the Gerber files for upload to your favorite PCB house. You can drop this ZIP file on OSH Park and they'll build you three of these blank PCB's for around $11 shipped. Oh, the 2K pot is the Bourns 3306W-1-202, available on Digikey.
TIU Signal Tester v1.0 Gerber.zip
OOPS! The CTS pot wasn't available, so I had to re-spin with one that was.